Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full behavioral burden. It discloses the upstream source (GeckoTerminal) and a trial-call quota per signed wallet, which is useful context, but omits return format, error handling, rate limits, and how the optional parameters combine. Most behavioral traits remain undisclosed.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short fragments, front-loaded with the essence ('Dex Price: Token price from GeckoTerminal'), with no wasted words. The emoji quota line is marketing-flavored but brief.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 5-parameter tool with 0% schema documentation, no annotations, and no output schema, the description is far too thin. It never explains the optional-parameter model, so an agent has essentially no basis for constructing a valid call.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% across 5 parameters (chain, token, symbol, address, network), and the description adds no meaning for any of them. An agent cannot tell whether to supply symbol, address, chain, or network, or how they interact.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource ('Token price') and names the data source ('GeckoTerminal'), so an agent knows what it retrieves. However, it does not differentiate from siblings like x402-token-price, x402-crypto-price, or x402-price-oracle, leaving the 'Dex' qualifier largely unexplained.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The only guidance is a pricing note ('5 free trial calls per signed wallet'), which hints at the x402 payment model but says nothing about when to prefer this tool over the many price siblings or what inputs are required. No when-to-use or exclusions are given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.